PIW(CR)-240 is a premium corona-resistant rectangular enameled copper wire featuring filled aromatic polyimide (PI) insulation – Class 240, specifically engineered for inverter-fed motor applications where partial discharge (corona) poses a significant threat to winding insulation life.

Compared to traditional round wires, the rectangular cross-section maximizes copper fill within a given slot – achieving 25-30% higher copper density – significantly reducing I²R losses and improving motor efficiency. The corona-resistant polyimide insulation incorporates inorganic fillers (such as titanium dioxide and silica dioxide) that dissipate electrical charge and suppress partial discharge activity, extending motor life in variable frequency drive (VFD) applications by up to 50-100 times compared to conventional Class 220 wires.

With a thermal class of 240°C, heat shock resistance up to 260°C, and a cut-through temperature exceeding 450°C, PIW(CR)-240 delivers exceptional reliability in the most demanding inverter-driven applications, including EV traction motors, HVAC compressors, and wind turbine generators. Also available under the Chinese national standard model QY(F)BPB-x/240.

·         Corona-Resistant Insulation – Filled polyimide insulation with inorganic fillers (TiO₂/SiO₂) suppresses partial discharge – extends inverter-driven motor life by 50-100× vs conventional Class 220 wires.

·         Class 240 Thermal Rating – Highest continuous operating temperature – 240°C, with cut-through exceeding 450°C – outperforms conventional Class 220 by a wide margin.

·         Rectangular Cross-Section – 25-30% higher copper fill factor compared to round wire – lower I²R losses, better heat dissipation, and compact high-power-density designs.

·         Multiple Film Grades – Available in Grade 1 (Single Build), Grade 2 (Heavy Build), and Grade 3 (Triple Build) for flexible dielectric strength selection.

·         Radiation & Chemical Resistance – Exceptional stability under gamma radiation, aggressive chemicals, and cryogenic temperatures – ideal for aerospace, nuclear, and downhole applications.

·         Global Standards Compliance – Meets IEC 60317-46, IEC 60317-47, GB/T 6109.22, and NEMA MW 16-C standards for corona-resistant grades.

CHINGCUNG PIW(CR)-240 corona-resistant rectangular wires are available under two equivalent model systems: the international PIW(CR) code and the Chinese national standard QY(F)BPB code. Both refer to the same product with identical specifications.

Both model systems use the same thermal class (240) and film grade numbering (1, 2, 3), where higher numbers indicate thicker insulation. Customers may specify either model when placing orders.

Key Technical Data: Heat Shock: 260°C · Cut-through Temperature: 450°C · Standards: IEC 60317-46, GB/T 6109.22, NEMA MW 16-C · Corona Resistance: Filled PI construction with TiO₂/SiO₂ fillers

Custom cross-sections and film grades are available upon request. Specifications: 1 – 20 mm². Aluminum and CCA versions also available.

Below are representative sizes for Grade 2. Grade 1 and Grade 3 are available upon request. Full dimensional table (1–20 mm²) is available upon request.

Full dimensional table including all cross-sections from 1 mm² to 20 mm² is available upon request. Corner radius can be tailored.

PIW(CR)-240 is specified in inverter-driven and variable frequency drive (VFD) applications where partial discharge resistance is critical:

Corona-resistant polyimide wire is supplied with moisture-proof vacuum packaging to preserve insulation properties.

·         Advanced Corona-Resistant Technology – Filled polyimide insulation with TiO₂/SiO₂ fillers provides superior partial discharge resistance for inverter-driven motors.

·         Dedicated Class 240 Production – Specialized polyimide production line with advanced multi-pass coating technology and in-line eccentricity inspection.

·         Comprehensive Film Grades – Grade 1, Grade 2, and Grade 3 available to meet varying dielectric strength and insulation thickness requirements.

·         Global Compliance – Strict adherence to IEC 60317-46, IEC 60317-47, GB/T 6109.22, and NEMA MW 16-C standards.

·         Flexible MOQ – Sample orders welcome for qualification testing; bulk orders supported with 15-20 working days lead time.

·         Engineering Support – Free DFM feedback for customized profiles, hybrid insulation, and custom film builds.

 Need a PIW(CR)-240 sample or technical datasheet?

Contact our engineering team for free samples, detailed specifications, or a customized quotation with your specific dimensions.

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